1. One-way ANOVA
   A study report in Journal of Small Business Management (1977) concluded that self-employed individuals experience higher job stress than individuals who are not self employed. In this study job stress was assessed with a 15-item scale designed to measure various aspects of ambiguity and role conflict. Rating for each of the 15 items were made using a scale with 1-5 response options ranging from strong agreement to strong disagreement. The sum of the ratings for the 15 items for each individual surveyed is between 15 and 75, with higher values indicating a higher degree of job stress.
   Suppose that similar approach, using a 20-item scale with 1-5 response options, was used to measure the job stress of individuals for 15 randomly selected real estate agents, 15 architects, and 15 stock brokers. The stress levels of the three professions are given below:

   Stress Level in Percent
   Real Estate	Architect	Stockbroker
   81	43	65
   48	63	48
   68	60	57
   69	52	91
   54	54	70
   62	77	67
   76	68	83
   56	57	75
   61	61	53
   65	80	71
   64	50	54
   69	37	72
   83	73	65
   85	84	58
   75	58	58

   
   Using = 0.05, test for any significant difference in job stress among the three professions . See a model example in week 3 lecture - Rate of Returns for Utility, Retail and Banking.
2. Parametric and Nonparametric Data Identification Assignment
   Label each of the following situations " P " if it is an example of parametric data or " NP " if it is an example of nonparametric data.
   1. In a comparison of two towns, is the average height of its residents the same? _____
   2. A manufacturer produces a batch of memory chips (RAM) and measures the mean-time-between-failures (MTBF). The manufacturer then changes a manufacturing process and produces another batch and again measures the MTBF. Did the change to the process improve the MTBF? _____
   3. The average life span of a dog is proportional to the amount of calcium consumed. _____
   4. The correlation between gene disorders and certain diseases. ______
   5. From a written survey where the respondents were asked to rate an individual on a scale of 1 to 5, one group rated an individual a 3.7, another group rated the individual a 4.3. Is the difference statistically significant? ____
   6. A study of vehicle accidents on a military installation compared to drivers' rank. ___
   7. Show that the numbers drawn in a state lottery are truly random. ____

8. There is a direct correlation to a student's grade and the student's rating of an instructor. __

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